2-sulfinyl-thiazoles and oxazoles

ABSTRACT

The invention discloses 2-sulfinyl-thiazoles and oxazoles having pharmacological activity in animals and useful as CNS depressant agents. The compounds may be prepared by reacting either a 2alkythio-thiazole or a 2-alkylthio-oxazole with an equimolar amount of a peracid in the presence of an inert, organic solvent.

0 United States Patent [191 [111 3,888,870 Jackson June 10, 1975 Z-SULFINYL-THIAZOLES AND OXAZOLES 3,668,212 6/1972 Shgn et al 260/302 5 [75] Inventor: Thomas E. Jackson, Madison, NJ.

Primary Examiner-R1chard J. Gallagher [73] Asslgnee: sandoz Hanover Attorney, Agent, or Firm-Gerald D. Sharkin; Richard 22 Filed; Mar. 8, 197 E. Vila; Joseph J. Borovian [21] Appl. No.: 449,511

[57] ABSTRACT 52 U.S. Cl. 260/302 s; 429/270; 429/272 The invention discloses 2991Fmybthiazoles and 51 Int. Cl. C07d 91/32; C07d 85/44 19198 having Pharmacological activity in animals and 58 Field of Search 260/302 s, 307 R useful as CNS depressant agents- The Compounds may be prepared by reacting either a 2-alkythio-thiazole or [56] References Cited a 2-alkylthio-oxaz0le with an equimolar amount of a UNITED STATES PATENTS peracid in the presence of an inert, organic solvent.

3,288,860 11/1966 Lyngss et a]. 260/307 R 12 Claims, N0 Drawings 1 2 Z-SULFINYL-THIAZOLES AND OXAZOLES lar, the compounds effect a depression of the central nervous system and are useful as minor tranquilizers The present invention relates to chemical comand sedative/hypnotic agents as indicated by their abilpounds and their use as pharmaceutical agents, and ity to produce docility in behavior tests in mice given more particularly, to 2-sulfinyl-thiazole and 2 sulfmyl 10 to 200 mg./kg. i.p. of test compound according to oxazole derivatives and their use as CNS depressants, the 30-W0rd ject e check Sheet system, basically dee.g., tranquilizer agents. scribed by S. Irwin, Gordon Research Conference, Me-

The compounds which are the subject of the present dicinal Chemistry 1949 and Chem- Symposium on invention may be represented by the following strucsedative and yp Drugs Williams and Wilkins tural f l 1: 10 1954 and the hexobarbital reinduction method of Win- Ro ter, J. Pharmacol. and Exp. Therap., 94, 7-11, 1948.

o For such uses, the compounds may be administered [1 orally or parenterally, preferably orally, and in admix- I S- R' I ture with conventional pharmaceutical carriers. The N dosage administered may vary depending upon known R variables such as the particular compound employed and the severity of the condition being treated. In genwherein era], satisfactory results are obtained when adminis- R and R are independently hydrogen, lower alkyl of tered at a daily dosage of from about 4 milligrams to 1 to 4 carbon atoms or phenyl of the formula: about 200 milligrams per kilogram of animal body Y weight, preferably given orally and in a single dose or in divided doses, two to four times a day. For most mammals, the total daily dosage is from about 300 milligrams to about 1600 milligrams of the compound with Y a single dose of from 600 to 1600 milligrams being Where Y and are independently hydrogen, halo of given at bedtime for sedative/hypnotic use. For use as atomic Weight of from 18 t0 lower alkyl of 1 t0 tranquilizers, the compounds of formula I are given in 4 Carbon atoms, lower alkOXY of 1 t0 4 Carbon divided doses offrom 75 to 800 milligrams, preferably atoms or trifluoromethyl, 75 to 400 milligrams four times a day. The compounds R is alkyl 0f 1 t0 6 carbon atoms, and of formula I are suitably administered in admixture Z is an yg of a Sulfur atom, with the P that with a solid or liquid pharmaceutically acceptable carat least one of R and R is phenyl as defined above. i or dil The compounds of formula I may be prepared by the For above uses, the compounds of structural formula following reaction scheme: I may be administered orally in such forms as tablets,

' z z i peracid I N solvent N R R II I wherein R, R, R and Z are as defined above. dispersible powders, granules, capsules, syrups and The preparation of compounds of formula I involves elixirs; and parenterally as solutions, suspensions, disthe reaction of a 2-alkylthio-thiazole or a 2-alkylthiopersions, emulsions, and the like, e.g., a sterile injectaoxazole of formula 11 above with not more than an equible solution such as an aqueous suspension. These molar amount of a peracid, e.g., m-chloropharmaceutical preparations may contain 0.5 percent peroxybenzoic acid, in the presence of an inert, organic 5 up to about 90 percent of the active ingredient in comsolvent which is adapted to dissolving the reactants and bination with the carrier or adjuvant, more usually beproduct compounds of formula I. Suitable solvents are tween 3 percent and percent by weight. Such comknown and available, and include by way of illustration, position may be prepared according to any method the chlorinated hydrocarbons, nitrated hydrocarbons, known in bc t or the manufacture of pharmaceutie.g., nitromethane, lower alkanols, e.g., ethanol, and cal COmPOSIUOHS, l ch ccmposltlons may contain ethers, e.g., dioxane, tetrahydrofuran, etc. The reaction 9 Or more cnvc t cnal adjuvants, such as sweetenis preferably effected in the presence of a chlorinated lng agents flalorlng agents Rolonng agents and P hydrocarbon, e.g., methylene chloride. The reaction serving agents, in order to provide an elegant and palatmay be carried out at temperatures in the range of from a e preparation. Tablets may contaln the actlve ingre- 20C. to 70C., preferably 5C. to 25C., and most dient in admixture with conventional pharmaceutical preferably, between 0C. and 10C. The reaction prodexcipients, e.g., inert diluents such as calcium phosuct of formula I may be isolated from the reaction mixphate, calcium sulphate dihydrate, lactose and talc, ture by working up by conventional techniques. granulating and disintegrating agents, e.g., starch and The compounds of formula II are either known or alginic acid, binding agents, e.g., starch, gelatin, polyvican be prepared in conventional manner from available nyl pyrrolidone and acacia, and lubricating agents, e.g., materials, e.g., by the procedures of Kjellin & Sandmagnesium sterate, stearic acid and talc. The tablets strom, Acta Chem. Scand., 23, 2879-2887 (1969). may be uncoated or coated by known techniques to The compounds of formula I are useful because they delay disintegration and adsorption in the gastropossess pharmacological activity in animals. In particuintestinal tract and thereby provide a sustained action over a longer period. Similarly, suspensions, syrups and elixirs may contain the active ingredient in admixture with any of the conventional excipients utilized for the preparation of such compositions, e.g., suspending agents (methylcellulose, tragacanth and sodium alginate), wetting agents (lecithin, polyoxyethylene stearate and polyoxyethylene sorbitan monooleate) and preservatives (ethyl-p-hydroxybenzoate). Capsules may contain the active ingredient alone or admixed with an inert liquid or solid diluent, e.g., calcium carbonate, calcium phosphate, kaolin, peanut oil, sesame oil and corn oil. The preferred pharmaceutical compositions from the standpoint of preparation and ease of administration are solid compositions, particularly hard-filled capsules and tablets.

Tablets and capsules containing the ingredients below may be prepared by conventional techniques and are useful in effecting tranquilization at a dose of one tablet or capsule two to four times a day.

EXAMPLE 1 2-methylsulfinyl-4-phenyl-thiazole.

To a cooled (ice/water) solution of 8.9 g. of 2 -methylthio-4-phenyl-thiazole pre-dissolved in 90 ml. of methylene chloride is added in portions over 5 minutes, 8.7 g. of m-chloro-peroxybenzoic acid. Examination by TLC after 90 minutes indicates the presence of essentially all of the sulfinyl compound (reaction complete) with a faint trace of sulfone and an even fainter trace of remaining thiazole starting material. The precipitated m-chlorobenzoic acid is filtered off and the methylene chloride solution is washed successively with a percent solution of sodium sulfite and with saturated sodium bicarbonate solution, dried, evaporated in vacuo to dryness and the residue further dried overnight in vacuo, to yield Z-methylsulfinyl-4-phenylthiazole, m.p. l04105C.

EXAMPLE 2 2-methylsulfinyl4,S-diphenyl-thiazole.

O S n l s CH To a cooled (ice/water) solution of 1.1 g. of 2- methylthio-4,5-diphenyl-thiazole pre-dissolved in 15 ml. of methylene chloride is added in portions over 5 minutes, 0.8 g. of m-chloro-peroxybenzoic acid. Examination by TLC after 30 minutes indicates the presence of essentially all of the sulfinyl compound (reaction complete). The precipitated m-chloro-benzoic acid is filtered off and the methylene chloride solution is washed successively with a 10 percent solution of sodium bisulfite and with saturated sodium bicarbonate solution, dried, evaporated in vacuo to dryness and the residue further dried overnight. in vacuo to yield 2- methylsulfinyl-4,S-diphenyl-thiazole, m.p. l02 l 03C.

EXAMPLE 3 Following essentially the procedure of Example 1, and using in place of 2-methylthio-4-phenyl-thiazole, an equimolar amount of:

a. 2-methylthio-5-phenyl-thiazole, b. Z-methylthio-5-methyl-4-phenyl-thiazole, c. 2-methylthio-4-methyl-5-phenyl-thiazole,

d. 2-ethylthio-4-phenyl-thiazole, e. 2-ethylthio-4,5-diphenyl-thiazole, f. 2-ethylthio-5-phenyl-thiazole, g. 2-ethylthio-5-methyl-4-phenyl-thiazole, and h. 2-ethylthio-4-methyl-5-phenyl-thiazole, there is obtained a. 2-methylsulfinyl-S-phenyl-thiazole, b. 2-methylsulfinyl-5-methyl-4-phenyl-thiazole, c. 2-methylsulfinyl-4-methyl-5-phenyl-thiazole, d. 2-ethylsulfinyl-4-phenyl-thiazole, e. 2-ethylsulfinyl-4,S-diphenyl-thiazole, f. 2-ethylsulfinyl-5-phenyl-thiazole, g. 2-ethylsulfinyl-5-methyl-4-phenyl-thiazole, and h. 2-ethylsulfinyl-4-methyl-S-phenyl-thiazole, respectively.

EXAMPLE 4 2-methylsulfinyl-4,S-diphenyl-oxazole.

To a cooled (ice/water) solution of 5.21 g. of 2- methylthio-4,5-diphenyl-oxazole pre-dissolved in 50 ml. of chloroform is added in portions over 5 minutes, 4.35 g. of m-chloro-peroxybenzoic acid dissolved in 50 ml. of chloroform. After stirring the reaction mixture for 20 minutes, the ice/water bath is removed and the reaction mixture stirred at room temperature for an additional 60 minutes. The precipitated m-chloro-benzoic acid is filtered off, washed with chloroform and the combined chloroform solution is washed with a 10% solution of sodium carbonate, dried, evaporated in vacuo to dryness, and the residue recrystallized from benzene/ligroin to yield 2-methylsulfinyl-4,5-diphenyloxazole, m.p. 78C.

EXAMPLE 5 2-ethylsulfinyl-4,S-diphenyl-oxazole.

To a cooled (ice/water) solution of 4.2 g. 'of 2- ethylthio-4,5-diphenyl-oxazole pre-dissolved in 30 ml. of methylene chloride is added in portions over 5 minutes, 30 g. of m-chloro-peroxybenzoic acid. Examination by TLC after 2 hours indicates the presence of essentially all of the sulfinyl compound (reaction complete). The precipitated m-chloro-benzoic acid is filtered off and the methylene chloride solution is washed successively with a percent solution of sodium sulfite and with saturated sodium bicarbonate solution, dried, evaporated in vacuo to dryness, and the residue further dried overnight in vacuo to yield 2 ethylsulfinyl-4,S-diphenyl-oxazole, m.p. l33l 34C.

EXAMPLE 6 Following essentially the procedure of Example 5, and using in place of 2-ethylthio-4,5-diphenyl-oxazole, an equimolar amount of:

a. 2-n-butylthio-4,S-diphenyl-oxazole,

b. 2-methylthio-S-phenyl-oxazole,

c. 2-methylthio-4-phenyl-oxazole,

d. 2-methylthio-5-methyl-4-phenyl-oxazole,

e. 2-methylthio-4-methyl-S-phenyl-oxazole,

f. 2-ethylthio-4-phenyl-oxazole,

g. 2-ethylthio-5-phenyl-oxazole,

h. 2-ethylthio-5-methyl-4-phenyl-oxazole, and

i. 2-ethylthio-4-methyl-5-phenyl-oxazole, there is obtained a. 2-n-butylsulfinyl-4,5-diphenyl-oxazole,

b. Z-methylsulfinyl-S-phenyl-oxazole,

c. 2-methylsulfinyl-4-phenyl-oxazole,

d. 2-emthylsulfinyl-5-methyl-4-phenyl-oxazole,

e. Z-methylsulfinyl-4-methyl-5-phenyl-oxazole,

f. 2-ethylsulfinyl-4-phenyl-oxazole,

g. 2-ethylsulfinyl-5-phenyl-oxazole,

h. 2-ethylsulfinyl-5-methyl-4-phenyl-oxazole, and

i. 2-ethylsulfinyl-4-methyl-5-phenyl-oxazole, respectively.

What is claimed is:

l. A compound of the formula:

wherein 1 to 4 carbon atoms or phenyl of the formula:

, ribwherein R, R and R are as defined in claim 1. 3. The compound of claim 2 having the formula:

wherein R and R are as defined in claim 2. 4. The compound of claim 2 having the formula:

wherein R and R are as defined in claim 2.

5. The compound of claim 2 which is 2- methylsulfinyl-4-phenyl-thiazole.

6. The compound of claim 2 which is 2- methylsulfinyl-4,5-diphenyl-thiazole.

7. The compound of claim 1 having the formula:

R 0 II wherein R, R and R are as defined in claim 1. 8. The compound of claim 7 having the formula:

wherein R R and R are as defined in claim 7.

9. The compound of claim 7 having the formula:

0 R 0 ll wherein R and R are as defined in claim 7. 10. The compound of claim 7 having the formula:

wherein methylsulfinyl-4,S-diphenyl-oxazole.

12. The compound of claim 7 which is 2- 

1. A COMPOUND OF THE FORMULA: R''-SO-C<(-Z-C(-R0)=C(-R)-N=) WHEREIN R* AND R ARE INDEPENDENTLY HYDROGEN, LOWER ALKYL OF 1 TO 4 CARBON ATOMS OR PHENYL OF THE FORMULA: Y,Y''-PHENYL WHERE Y AND Y'' ARE INDEPENDENTLY HYDROGEN, HALO OF ATOMIC WEIGHT OF FROM 18 TO 80, LOWER ALKYL OF 1 TO 4 CARBON ATATOMS, LOWER ALKOXY OF 1 TO 4 CARBON ATOMS OR TRIFLUOROMETHYL, R1 IS ALKYL OF 1 TO 6 CARBON ATOMS, AND Z IS AN OXYGEN OR A SULFUR ATOM, WITH THE PROVISO THAT AT LEAST ONE OF R* AND R IS PHENYL AS DEFINED ABOVE.
 2. The compoud of claim 1 having the formula:
 3. The compound of claim 2 having the formula:
 4. The compound of claim 2 having the formula:
 5. The compound of claim 2 which is 2-methylsulfinyl-4-phenyl-thiazole.
 6. The compound of claim 2 which is 2-methylsulfinyl-4,5-diphenyl-thiazole.
 7. The compound of claim 1 having the formula:
 8. The compound of claim 7 having the formula:
 9. The compound of claim 7 having the formula:
 10. The compound of claim 7 having the formula:
 11. The compound of claim 7 which is 2-methylsulfinyl-4,5-diphenyl-oxazole.
 12. The compound of claim 7 which is 2-ethylsulfinyl-4,5-diphenyl-oxazole. 